The U.S. has said it is willing to disclose classified information to Russia on the missile defense shield to be deployed in Europe, a move that a military analyst said could solve the impasse over the American program.

The plans to share unspecified “secret data” on the missile defense shield with Russia were first voiced late last week by Bradley Roberts, U.S. Deputy Assistant Defense Secretary. Pentagon spokeswoman April Cunningham confirmed this information for a Kommersant newspaper article published on Monday.

It is not yet clear exactly which data may be disclosed to Russia, which has for years strongly opposed American plans to deploy a missile defense shield in Eastern Europe, including Poland, Romania and the Czech Republic.

The White House insists the program is aimed against a potential threat from rogue states such as Iran and North Korea but Russia says its own missiles will also fall under the shield, destroying the nuclear balance that existed since the Cold War.